Support conditional includes with exists

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Release notes

Problem to solve

Today it is possible to use rules:if as part of include blocks in pipelines. This is great but doesn't expose the full power of rules available with other keywords, such as exists.

Proposal

Allow the exists keywords to be used as part of an include:rules block:

include:
  - local: builds_docker.yml
    rules:
      - exists:
          - Dockerfile

test:
  stage: test
  script: exit 0